Include bthub support.

As mario knows, it should be in another component, but just cram
it here for now until someone solves kernel module dependencies
for us.

USB bluetooth device rump component.

This is a curious driver in the sense that unlike all other current
device drivers, it does not require vfs. This is because the driver
is controlled via blueto

USB bluetooth device rump component.

This is a curious driver in the sense that unlike all other current
device drivers, it does not require vfs. This is because the driver
is controlled via bluetooth, which is controlled via PF_BLUETOOTH
sockets (as opposed to a /dev node).

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